• Pilot laboratory for conducting the international inter-laboratory comparison (ILC) on volume (micropipettes) and Glass Scale among the South Asian Association for Regional Cooperation (SAARC) National Metrology Institute (NMIs) under the SAARC-PTB project to strength the quality infrastructure in SAARC region. This inter-comparison is under process (2019-2022).
• Participated in the international key comparison (APMP.M.FF-K4.2.2021) on volume (micro-pipettes) organized among Asia Pacific Metrology Program (APMP) NMIs (2021).

• CSIR-National Physical laboratory (Length, Dimension & Nano Metrology section) participated in International key comparison in length parameter for 610 mm step gauge registered as EURAMET.L-K5.2016, Piloted by NPL UK with various participating NMIs. The measurements for this intercomparison were carriedout by NPL India in 2018, using Coordinate Measuring machine (CMM)LEGEX 9106 , at Length, Dimension and Nano Metrology Section.As per the report that came in June 2020, wehave successfully qualified the intercomparison and stood at par with global NMIs with Envalues 0.57. The intercomparison reports has been published in KCDB portal and Metrologia which can be accessed through the links: 
  – https://www.bipm.org/documents/20126/45451596/EURAMET.L-K5-2016.pdf/21d936a0-fcf0-ec46-ed40-2e584e63222f
  – https://iopscience.iop.org/article/10.1088/0026-1394/57/1A/04002
  
  
• Length Dimension and Nano Metrology, NPL India, piloted international intercomparison APMP.L-S7 for step height standards with NIM Thailand, NMI Japan, BEV Austria and A*STAR Singapore. This intercomparison (APMP.L-S7) was conducted for a wide range (8 nm, 18 nm, 88 nm and 10 µm) of step heights, for new CMC claims. The final analysis was completed in June 2021 and the intercomparison report has been published on KCDB portal and metrology, which can be accessed through links:
  – https://www.bipm.org/documents/20126/45452292/APMP.L-S7.pdf/9f10ad91-25dd-3af8-acb5-900cdbc17027
  – https://iopscience.iop.org/article/10.1088/0026-1394/58/1A/04003/meta
  
  
  

  APMP.L-S7 Results

• Temperature and Humidity Metrology has participated in different inter-comparisons as listed in the Table below:

Force and Hardness Metrology Section

• The different inter-comparisons participated in the force and hardness parameters are listed in the Table below:

 List of Inter-comparisons Participated:

The result of the APMP M.F.-K2 force comparison of the primary standard force machine at 50kN and 100kN are depicted in Fig.1 and Fig.2 respectively, as representative figures, to a give a feeling for the reader about the accuracy and the international standing reputation of these standards.  It also reveals the importance of such inter-comparison which in fact requires a continuous maintenance for achieving the global competence. The results of the other inter-comparison carried out in the other parameters mentioned above also look similar in terms of its closeness to the key reference value of the comparison through which the CMC are reaffirmed.

Inter-comparison data at 50 kN

Inter-comparison data at 100 kN force

1. KRISS (Korea), 2. NML-SIRIM (Malaysia), 3. NIS (Egypt), 4. NPLI (India), 5. A* Star (Singapore), 6. SCL (Hong Kong), 7. VMI (Vietnam), 8. ITRI (Taipei), 9. NIMT(Thailand), 10. KIM-LIPI (Indonesia), 11. KEBS (Kenya), 12. NIM (China), 13. NMIJ (Japan).

• APMP.M.P K4 key comparison in the pressure range of 1 Pa to 10 kPa and submitted the results to pilot laboratory KRISS Korea
• APMP.M.P K15 key comparison draft-A data to NMIJ, Japan in the vacuum range of 10^-4 Pa to 1Pa
• International BIPM/CIPM Key Comparison on Total Ultrasonic Power Measurement, (key comparison CCAUV.U-K3.1) (Weblink: https://iopscience.iop.org/article/10.1088/0026-1394/53/1A/09002)
• International APMP Key Comparison on Total Ultrasonic Power Measurement (APMP TCAUV key Comparison APMP.AUV.U-K3) (Ongoing)
• CSIR-NPL participated in an Internal Key Comparison on vibration in frequency range of 0.1 Hz to 40 Hz with Center for Measurement Standards, ITRI, Taiwan as pilot laboratory in October, 2018. The Final report of International Key Comparison Exercise, APMP.AUV.V-K3.1 circulated amongst participants in June, 2020 has validated CSIR-NPL CMCs in range 0.1 Hz to 40 Hz published in March 2021(Final report yet to be published in BIPM website)
• Linkage of different Key comparisons, CCM.P-K13, APMP.M.P-K13, EURAMET.M.P-K13 and EURAMET.M.P-K7 for pressure ranges from 250 MPa to 500 MPa (https://www.bipm.org/kcdb/comparison/download/published-section-block-file/74/245/degree/245/m.p-k13_nov18.pdf)
  

  Linkage of different Key comparisons in 250 MPa

CSIR-NPL participated in an Internal Key Comparison on vibration in frequency range of 0.1 Hz to 40 Hz with Center for Measurement Standards, ITRI, Taiwan as pilot laboratory in October, 2018. The Final report of International Key Comparison Exercise, APMP.AUV.V-K3.1 circulated amongst participants in June, 2020 has validated CSIR-NPL CMCs in range 0.1 Hz to 40 Hz published in March 2021(Final report yet to be published in BIPM website).

• The Fluid Flow Metrology Section has participated in APMP Supplementary Comparison (APMP.M.FF-S3.2020) of water flow using Coriolis mass flowmeter of DN20 size, make Emerson as artifact. Total 7 NMIs, namely, NIMT, Thailand; NMIA, Australia; NMIJ, Japan; NMC A*Star, Singapore; CSIR-NPL (NPLI), India; ITDI, Philippines and EMI, United Arab Emirates (UAE) are participating in this intercomparison and NIMT, Thailand is Pilot Laboratory. The measurement was done during March-April 2021. The artifact was installed in DN50 line after fabrication of a special adaptor for this purpose. The following figure shows installation of the mass flowmeter in NPL Primary Water Flow Calibration Facility. The measurement was done at 6 flow rates, namely, 10, 25, 40, 70, 100 and 120 kg/min. There was a problem of flow controllability at lower flow, therefore, a special set-up for control of flow using DN15 electromagnetic flowmeter, DN15 ball valve and DN15 gate valve was prepared. The measurement results were sent to the pilot laboratory and the report of this intercomparison is awaited.
  

  (a) New 5 SS Pipe Lines along with associated instrumentations and controls of Primary WFCF

  

  (b) Installation of Coriolis Mass Flowmeter (c) Display of Coriolis Mass Flowmeter in Primary WFCF

  Figure: Set-up for intercomparison (APMP.M.FF-S3.2000) of Artifact in Primary WFCF

• Participated in APMP Intercomparison (APMP.M.FF-K6.2018) on Low-pressure Gas Flow using Rotary Gas Meter as Artifact
  The Fluid Flow Metrology Section participated in APMP Key comparison (APMP.M.FF-K6.2018) on low pressure gas flow using rotary gas meter as artifact during January-March 2020. In this intercomparison, total 9 NMIs (i.e. KRISS-Korea; CMS-Chinese Taipei; NPLI-India; NIM-China; NIMT-Thailand; NMC A*Star–Singapore; NMIA-Australia; RCM-LIPI-Indonesia and VMI-Vietnam) are participating and KRISS, Korea is the Pilot Laboratory for this intercomparison. For this intercomparison, we developed fully automatic set-up (except for flow control) for calibration/ measurement of the artifact. We also developed pulse to pulse converter using Eaton MTL5532 safety barrier. The measurement data taken using NPL Pulse to Pulse Converter was also compared using KRISS Pulse to Pulse Converter and found satisfactory results. The following figure shows the photograph of the set-up along with screenshot of the automation program developed for this purpose. In the set-up, approx. 42D upstream and 15D downstream straight length were provided to artifact for improved flow profile. The measurement results were sent to the pilot laboratory and the report of this intercomparison is awaited.
  

  (a) Set-up showing reference flowmeter, rotary gas meter, pressure & temperature instrumentation, CRO, frequency counter and piping system

  

  (b) Air Receiver of 1000 L capacity (c) Air compressor system and gas cylinders (d) Screenshot of Automation Program

  Figure: Set-up for calibration APMP.M.FF-K6.2018 Key comparison artifact i.e. Rotary Gas Meter